{
  "type": "array",
  "items": {
    "type": "object",
    "required": ["average_duration_in_seconds", "date"],
    "properties": {
      "average_duration_in_seconds": {
        "type": ["integer", "null"]
      },
      "date": {
        "type": "string"
      }
    },
    "additionalProperties": false
  }
}

